Dressing mechanism



July 6 1926.

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ALTO1\T P. SLADE AND EDWARD W. BULLOCK, OF ROCHESTER, NEW YORK, ASSIGNORS T0 GLEASON WORKS, OF ROCHESTER, NE'W' YORK, A CORPORATIOF' OF NEW YORK.

DRESSING MECHANISM.

Application filed August 27, 1923. Serial No. 659,547.

This invention relates to a dressing mech anism, and is particularly adapted for dressiug annular face mill type of grinders such as employed for grinding curved tooth gears or curved slots,- although the invention is equally adaptable to dressing other grinding members or abrasive surfaces.

One of the chief objects of the invention is to provide a grinding device which automatically trues itself by engaging the work in such a manner as to insure a continuous change of relationship of the grinding device, and uniform wear at all points of its operative surface.

In a more particular aspect, the invention has for its purpose to aiford a grinding device with a curved dressing surface, preferably conforming to a spherical section, and mounted in such a manner as to cause it to rotate about two independent axes which are angularly related and effect a constant change of position of the curved surface wit-h reference to the work, and reversal of the direction of rotation of the grinding device at periodic intervals.

An additional object of the invention is to impart such motion to a grinding device as to automatically maintain the same contour, irrespective of its size or of the amount of wear to which it is subjected.

VA further purposeof the invention is to provide a practical and efficient arrangement of parts for opearting a series of dressing 7 devices in the manner referred to, for cooperation with the opposite sides, and edge,

of an annular face mill type of grinder such as employed on curved tooth gear grinding machinery.

To these and comprehends the various improvements that will appear clearly from the following description, when read in conjunction with the accompanying drawings, the novel features being pointed out in the claims following the description.

In the drawings:

Figure 1 is a side elevationof 01169111- bodiment of the invention, showing its application to a practical form of apparatus as adapted for dressing an annular face mill and driving one of the grinding devices;

Figure 5 is an enlarged view looking in the same direction as Figure fl, showing the parts for supporting the grinding device in horizontal section;

Figure 6 is an enlarged sectional view taken substantially on line 6-6 of Figure 4;

Figure 7 is a sectional view on line 77 of Figure 4, with parts in elevation;

Figure 8 is an enlarged plan view;

Figure 9 is a sectional view on line 99 of Figure l; a

Figure 10 is a sectional view on line l010 of Figure 9;

Figure 11 is a sectional view on line 1l-11 of Figure 2, and

Figure 12 is a diagrammatic view illusstrating successive positions of the grinding device with reference to the work.

In the construction shown, which is intended merely as an example of different possible practical embodiments of theinvention, 1 designates a pedestal or support adapted to be attached to the frame of a gear grinding machine, or other apparatus where it may be desired to dress a grinder, the support 1 being provided with the grindingdevices and operating mechanism for cooperation with the grinder. p l i 2 designates a bed orbase at the top of the support 1, while 3 are housings adjustother ends, the inventions able on the bed 2 and enclosing mechanism for ifecting reciprocation of a pair of oppositely inclined grinding devicesfor cooperation with opposite faces of the. grinder, as illustrated generally in Figure 2.- s

The oppositely arranged grindingdevices are carried by reciprocatory slides 5 and 6 which are actuated by means of a pinion 7 engaging rack teeth on adjacent faces of the slides 5 and 6. By this means, the slides 5 and 6, and the grinding devices carried thereby, which will be described presently,

are alternately operated first in one direction and then in the other.

The pinion 7 is driven by the curved rack 8, see Figure 1, which in turn is operated by a pinion 9. The pinion 9 is oscillated by a reciprocatory rack bar 10 formed on one side of a plate which carries on an adjacent face a rack bar 11 engaged and operated by a pinion 12 on the driven shaft 13, to which power is supplied by any suitable instrumentalities operating to oscillate said shaft at regular intervals.

The mechanism thus far described causes movement of the slides 5 and 6 which carry the grinding devices that cooperate with the side faces of the grinder, while the edge of the grinder is engaged by a dressing device, see Figure 3, that is connected to and operated by the oscillatory arbor 15. The latter carries a pinion 16 that is driven by the gear 17 mounted on spindle 18. The spindle 18 carries a pinion 19 that is engaged and driven by gear 20 carried by the sleeve 21. The latter also carries the gear segment 22, see Figure 10, that is engaged and operated by the reciprocatory rack 11. In this fashion, the arbor 15 is oscillated, and with it the grinding device which cooperates with the edge of the grinder, see Figure 3.

The grinding device or wheel 25, which is made of carborundum or other suitable material, has a curved operative surface 26, preferably conforming to a section of a sphere, and is mounted to turn about two independent axes arranged at angles to each other. This is preferably accomplished by mounting the grinding wheel 25 in a yoke or holder 27, on bearings 23, so as to turn when brought into engagement with the rotating grinder, and the dressing wheel is preferably set at approximately the angle shown in reference to the surface to be dressed. The holder 7 is mounted for rotation in a housing 28, being supported in a ball bearing 29, while is a spring connect ing the arbor 15 with the inner end of the holder 27. The housing 28 is slidable within the sleeve 21, and 31 is a spring cooperating between adjacent faces of the housing 28 and sleeve 21 and acting to move the housing outwardly and thereby hold the grinding device in contact with the grinder or surface to be dressed.

The grinding wheel 25 rotates about its own axis within the holder 27 as it is engaged with the grinder, and while thus rotating, its holder 27 is turned about its axis which is at right angles to the rotative axis of the grinding wheel. Such oscillation of the holder 27 causes the grinding wheel 25 to be constantly changed in its relationship to the grinder so as to present different portions of its curved surface at the dressing point. The effect obtained is that of a spherical body rotating about two central axes at right angles to each other so that every point of the grinding wheel is brought into contact with the grinder, thus insuring even and uniform wear at every point of the grinding wheel. This result is further assisted by the fact that. the grinding wheel reverses its direction of rotation each time its holder 27 completes a half turn, and causes a reversal of the position of the grinding wheel, the grinding wheel coming to a stop between such changes of direction. The mechanism for supporting and oscillating the other grinding wheels, which cooperate with the side faces of the grinder will now be described.

Referring to Figures 2, l, 5 and ('3, each of the slides 5 and 6 carries a holder 10, and since the support -10 and parts carried thereby are the same for both of the slides 5 and 6, it will be necessary to describe only one of these. Mounted in the support 10 a holder +11 adapted to turn in bearings 1-2, and pivotally supported in the holder 11 on bearings -13 is the grinding wheel 14-. which is preferably of the same form as wheel 25 already described. The parts are so arranged as to position the dressing wheel llinitially, approximately as shown in Figure 5, with reference to the grinder m, the grinding wheel 4-1 being adapted for dressing engagenienz with the face i J while the opposite face a is engaged by a similar grinding wheel mounted on the other slide The grinding wheel at is rotated by engagement with the rotating grinder as, and the necessary oscillating movement of the holder 41 about its axis, at right angles to the axis of rotation of the grinding wheel, is accomplished in the following manner.

The holder 11 is provided with a friction member or sleeve 45 made of cork or other suitable material, see Figures 5 and (3, and d6 is a friction rod which engages the friction sleeve 15 and serves to turn the latter and with it the holder 11. The friction rod 46 has one end bearing freely against a stationary stop plate 17 secured to the bed or frame of the machine. while its opposite end is connected by a spring 48 to a pin -19 calried by the support -10, thus serving to hold the friction rod 1-6 against the stop plate l? as the slide 6 reciprocates. 50 is a lea 1" spring acting to maintain the friction rod 16 in proper contact with friction sleeve 15. By this means, as the slide 6 is moved inwardly and mn wardly, the support 10, and with it the fri tion sleeve 4-5, is likewise moved. and the friction sleeve being in contact with the relatively stationary friction rod 16. is turned by the latter. thus alternately reversing the position of the holder 11 within which the dressing wheel rotates. The dressing wheel is thus caused to traverse the surface 0: of the grinder, and while traversing it and rotho cover any modifications or departures coming within the purposes of the improvements or the scope of the following claims.

We claim:

1. A dressing mechanism comprising a rotary grindingdevice with a curved grinding surface having movement in two directions with reference to the surface being dressed about axes which intersect each other at the center of the grinding device.

2. A dressing mechanism comprising a rotary grinding device with a grinding surface having the form of a section of a sphere, and means for shifting its axis of rotation about a second axis intersecting the first axis at the center of the grinding device.

3. A dressing mechanism comprising a rotary grinding device with a curved grinding surface, and means for shifting the axis of rotation of the grinding device about a second axis intersecting the first axis at the center of the grinding device.

4. A dressing mechanism comprising a rotary grinding device with a grinding surface having the form of a section of a sphere, and having movement in two directions with reference to the surface being dressed about axes which intersect each other at the center of the grinding device.

5. A dressing mechanism comprising a grinding device having turning movement in two directions about axes which intersect each other at the center of the grinding device.

6. A dressing mechanism comprising a rotary grinding device which has a turning movement about two axes which intersect each other at the center of the grinding device.

T. A dressing mechanism comprising a rotary grinding device, a support therefor mounted for turning about an axis intersecting the axis of rotation of the grinding device at the center thereof, and means for imparting turning movement to the support.

8. A dressing mechanism comprising a grinding device having the form of a section of a sphere and rotatable about twoaxes which intersect each other at the center of the grinding device.

9. A dressing mechanism comprising a grinding device having the form of a section of a sphere, and means for turning said grinding device about two axes intersecting each other at the center of the grinding device.

10. A dressing mechanism comprising a grinding device having a curved grinding surface that turns about two axes intersecting each other at the center of the grinding device.

11. A dressing mechanism comprising a rotary grinding device, and means for turning the grinding device in the plane of its rotary axis about a second axis passing through the center of the grinding device.

12. A dressing mechanism comprising a grinding device rotatively mounted on a support, and means for turning the support about an axis passing through the center of the grinding device.

13. A dressing mechanism comprising a rotary grinding device having a curved surface cooperating with the surface to be dressed, a support for the grinding device, and means for turning the support so as to bring different portions of the curved surface into contact with the surface to be dressed and to reverse the direction of rotation of the grinding device at predetermined intervals.

14:. A dressing mechanism comprising a grinding device rotatively mounted on a support, the support having turning movement about an axis intersecting the axis of rotation of the grinding device at the center of the latter, and means for oscillating the support.

15. A dressing mechanism comprising a reciprocatory slide, a holder rotatively mounted on the slide, a grinding device rotatively mounted on the holder, and means actuated during reciprocation of said slide for oscillating the holder.

16. A dressing mechanism comprising a reciprocatory slide, a holder rotatively mounted on the slide, a grinding device rotatively mounted on the holder, and means actuated during reciprocation of said slide for oscillating the holder, said means comprising a driven element on the holder and a relatively stationary driving element cooperating therewith as the slide travels back and forth.

17. A dressing mechanism comprising a pair of reciprocatory slides arranged at angles to each other, an oscillatory driving device cooperating with said slides for op erating them alternately in opposite directions, holders rotatively mounted on the slides, grinding devices rotatively mounted on the holders and arranged for engagement with oppositely inclined faces of a grinder, and means actuated during the re ciprocation of said slides for oscillating said holders.

18. A dressing mechanism comprising a pair of oppositely inclined reciprocatory slides, holders rotatively mounted on the slides, grinding devices rotatively mounted on the holders and arranged for coopera- (ion with opposite side faces of a grinder, means operating during reciprocation of said slides for oscillating the holders, a grinding device arranged for cooperation with the edge of the grinder, a holder in which it is mounted, and driving mechen- 10 ism operating to oscillate said last mentioned holder and to reciprocate the afore mentioned slides.

In witness whereof, We have hereunto signed our names.

ALTON P. SLADE. EDXVARD TBULLOCK. 

